To celebrate the 10-year anniversary of bitcoin, cryptocurrency trading platform Etoro has set up a crypto ATM on London's Finsbury Avenue Square.
However the machine comes with a twist: you have to tunefully wish it a happy birthday to it if you want to get your hands on some free bitcoin.
The ATM, which Etoro said is the first of its kind, will be handing out free vouchers to Londoners today worth between £20 and £250 in bitcoin for those brave enough to crack a note.
A digital display will let the choir know whether they need to sing louder and how much of the song they need to complete in order to trigger a voucher.
Once Halloween is over, the machine will go on a tour of the UK. Several professional football clubs have been lined up for its first string of bookings, where fans can belt out football chants to win some coins.
Today marks the 10th anniversary of the publication of a white paper on bitcoin, written by the anonymous developer Satoshi Nakamoto. Since then, bitcoin and other cryptocurrencies have gone on to achieve mass hype across multiple industries, with even big players such as Kodak getting in on the trend by creating mining technology for the asset.